Active shooter situations are, by nature, unpredictable and evolve quickly. That’s the first observation officials with The Department of Homeland Security make before offering what tools and resources they have. In many cases, DHS officials say, there is no pattern or method to the selection of victims by an active shooter. According to the New York Times , on average, there have been about five school shootings each month since 2014. That includes episodes not classified as mass shootings. The